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Balance Sheet Details - Warranty Accrual (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance $ 1,390 $ 863
Accrual for current period warranties 677 912
Warranty costs incurred (387) (668)
Ending balance $ 1,680 $ 1,107